Method for regulating the warp tension in a weaving machine and warp let-off device for carrying out the method

In order to feed warp threads (12) to a shedding apparatus (20) of the weaving machine, a warp beam (10) is driven in the unwinding direction by an electric motor (56) via a reduction gear (58). A tension beam (14) arranged pivotably about a shaft (32) serves for tensioning the warp threads (12). Th...

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Bibliographic Details
Main Author LOHER, HANS
Format Patent
LanguageEnglish
German
Published 14.02.1986
Edition4
Subjects
LOOMS
METHODS OF WEAVING
TEXTILES
WEAVING
WOVEN FABRICS
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Summary:In order to feed warp threads (12) to a shedding apparatus (20) of the weaving machine, a warp beam (10) is driven in the unwinding direction by an electric motor (56) via a reduction gear (58). A tension beam (14) arranged pivotably about a shaft (32) serves for tensioning the warp threads (12). The warp-thread tension can be set by means of a tensioning spring (34) acting on the tension beam (14). In order to keep the set warp-thread tension constant, the warp let-off drive (56, 58) is regulated in dependence on the mean pendulum position of the tension beam (14) by a variation of the rotational speed. For this purpose, the instantaneous pendulum position of the tension beam (14) is sensed by a detector (38). The output signal of the detector (38) is fed via a signal-processing circuit (42) to a speed controller (46) which influences the speed of the electric motor (56). The signal-processing circuit (42) gives the control device a PID characteristic. The result of such a type of control is a warp-thread tension which is always constant and which is independent of the winding diameter of the warp beam (10) and of further influences acting on the warp-thread tension.
Bibliography:Application Number: CH19810008059